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Hello, I am from the future. Vtuber companies started using AI to replicate not only the voice of their talents but also their very personalities.
In case of a hiatus or even a graduation the talent is essentially replaced by this AI in targeted and controlled projects (to keep it safe and avoid the AI going wild) to keep the character IP alive even after graduation.
Newly signed talents have to agree to essentially "sell" themselves to the company indefinitely, so the company can keep using them even if they leave. This has caused a lot of backlash from existing talents, especially the big ones, that do not want their voices being used like this without any benefit to them if they ever leave.